Altitude sickness – known as soroche in Peru – is a common problem for visitors, especially if you are travelling quickly between the coast or jungle regions and the high Andes. The best way to prevent it is to eat light meals, drink lots of coca tea, and spend as long as possible acclimatizing to high altitudes (over 2500m) before carrying out any strenuous activity. Anyone who suffers from headaches or nausea should rest; more seriously, a sudden bad cough could be a sign of pulmonary edema and demands an immediate descent and medical attention – altitude sickness can kill. People often suffer from altitude sickness on trains crossing high passes; if this happens, don’t panic, just rest and stay on the train until it descends. Most trains are equipped with oxygen bags or cylinders that are brought around by the conductor for anyone in need.

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